Generally, no. AP tests and SAT subject tests are both offered by the College Board, but in the United States, the scores on AP tests only matter after you are admitted to college, when some universities will offer you credit for your scores on those tests. You can search the credit policies of different universities at the College Board.

The SAT Subject tests are meant to test your knowledge of specific subject matter, and at the universities that use them, the scores do matter for admissions. 

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